class C1:
    def __init__(self):
        self.__X = None

    def meth1(self):
        self.__X = 88

    def meth2(self):
        print(self.__X)


class C2:
    def __init__(self):
        self.__X = None

    def metha(self):
        self.__X = 99

    def methb(self):
        print(self.__X)


class C3(C1, C2):
    pass


I = C3()
I.meth1()
I.metha()
print(I.__dict__)
I.meth2()
I.methb()
